Which one of the following species has a plane triangular shape?

1.	\(\mathrm N_3^-\)	2.	\(\mathrm {N O}_{3}^{-}\)
3.	\(\mathrm {N O}_{2}^-\)	4.	\(\mathrm {C O}_{2}\)

An electron-deficient compound among the following is:

Which of the following is a polar molecule?

A paramagnetic molecule among the following is:

Isostructural pair among the following is:

1. ${\mathrm{BCl}}_3$ $\mathrm{and}$ ${\mathrm{BrCl}}_3$

2. ${\mathrm{NH}}_3$ $\mathrm{and}$ ${\mathrm{NO}}_3^{-}$

3. ${\mathrm{NF}}_3$ $\mathrm{and}$ ${\mathrm{BF}}_3$

4. ${\mathrm{BF}}_4^{-}$ $\mathrm{and}$ ${\mathrm{NH}}_4^{+}$

The bond order of 1.5 is shown by:  

Identify the wrong statement among the following.

Which of the following species contains three bond pairs and one lone pair around the central atom?

1. \(\text H_{2} \text O\)

2. \(\text{BF}_{3}\)

3. \(\text{NH}^-_2\)

4. \(\text{PCl}_{3}\)